1. first of all make sure that you are running latest version of ICTFAX and ICTCore2. crond service is running and up, and we have ictcore.cron installed in /etc/cron.d folder3. further check if ictcore user read and write permission on /var/spool/mail/ictcore

In case there is still errors then please share error logs with us ( from /usr/ictcore/log/ictcore.log )